/*
 * Copyright (C) 2010 Imavis Srl
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.imavis.video.parse.mpeg4;

import com.imavis.video.parse.CodingType;
import com.imavis.video.parse.VideoInfo;
import com.imavis.video.parse.VideoParser;
import com.imavis.video.parse.mpeg4.impl.StartCode;
import com.imavis.video.parse.mpeg4.impl.VideoObjectLayer;
import com.imavis.video.parse.mpeg4.impl.VideoObjectPlane;
import com.imavis.video.parse.mpeg4.impl.VideoObjectPlaneParser;
import java.awt.Dimension;
import java.nio.ByteBuffer;

/**
 *
 * @author Aldo Brucale
 */
public class Mpeg4Parser extends VideoParser {
    private VideoObjectLayer vol;
    private final VideoObjectPlaneParser vopParser = new VideoObjectPlaneParser();

    @Override
    protected VideoInfo doParse(final ByteBuffer bb) {
        final VideoInfo videoInfo = new VideoInfo();
        if (StartCode.VOL_START.seek(bb)) {
            vol = VideoObjectLayer.parse(bb);
            videoInfo.setResolution(
                    new Dimension(vol.getWidth(), vol.getHeight()));

        } else {
            bb.rewind();
        }

        if (StartCode.VOP_START.seek(bb)) {
            final VideoObjectPlane vop = getVopParser().parse(bb);
            videoInfo.setCodingType(vop.getCodingType());
            videoInfo.setKeyFrame(vop.getCodingType() == CodingType.I);
        }

        return videoInfo;
    }

    private VideoObjectPlaneParser getVopParser() {
        return vopParser;
    }
}
